WASHINGTON — President Obama is sending more troops and military aircraft to Uganda as part of a long-running effort to hunt down Joseph Kony, the fugitive rebel commander who is believed to have been hiding in the jungles of central Africa for years, a Defense Department official said on Sunday.

The president is sending several CV-22 Osprey aircraft, along with 150 Air Force Special Operations forces and other airmen, to join the American troops already in the region to help the Ugandan government find Mr. Kony.

The escalation, first reported on Sunday by The Washington Post, does not change the nature of the United States’ military presence on the ground in central Africa. American forces will continue to advise and assist their counterparts in the African Union’s military task force tracking Mr. Kony and his Lord’s Resistance Army across Uganda, Central African Republic, South Sudan and the Democratic Republic of Congo. The Americans are forbidden to fight the L.R.A. themselves except in self defense.

The hunt for Mr. Kony and his fighters has generated a huge amount of publicity around the world, in large part because of a video on his elusiveness and brutality, “Kony 2012,” that has been viewed nearly 100 million times on YouTube.